Machine for trimming boot or shoe uppers



(N0 Model.)

B. S. HARRIS. I MACHINE FOR TBIMMING BOOT, OR SHOE UPPBRS. No. 540,051.,Patgljfl May 28, 1895.

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INVENLTUQT Farce.

ATENT ELMER S. HARRIS, OF HAVERHILL, MASSACHUSETTS.

MACHINE FoR TRIMMING BOOT OR SHOE UPPERSL SPECIFICATION forming part ofLetters Patent No. 0,051, dated May 28, 1895.

A 'olication filed March 25 1 8 9 5 To all whom it may dancer-n:

Be it known that I, ELMER S. 'HARRIs, of Haverhill, in the county ofEssex and State of Massachusetts,have invented certain new and usefulImprovements in Machines for Trimming Boot or Shoe Uppers, of which thefollowing is aspecification.

This invention relates to machines for trimming the projecting edges ofthe channeled lip and upper of certain boots and shoes, particularlyturned shoes, in which the lip formed on the channel in cutting the solefor the reception of the stitches and the upper which is secured to thesole by said stitches stand out from the surface of the sole and havesurplus material outside of the line of stitches which requires to becut away. A machine is now inuse for trimming off this surplus material,said machine comprising a rotary shaft havinga cutter-head with diverging shear-blades and a fixed shear-blade which constitutes a rest for thechannel-lip during the trimming operation, the lip and the projectingportion of the upper being supported by the said fixed shear-blade andtrimmed by the conjoint operation of said blade and the blades of therotating cutter-head. Heretofore the acting edges of the blades of thecutterhead and the co-operating cutting edge of the fixed shear-bladehave been arranged in a plane at right angles to the axis of thecutterhead, as shown in Letters Patent No. 343,452, granted to me June8, 1886. This form of cutter-head and fixed shear-blade isobjectionable, becausein trimming along the shankportion where the edgesto be trimmed form a re-entrant curve, the blades at the opposite sideof the cutter-head from the fixed shearblade necessarily strike portionsof the work and are liable to cut the same injurionsly.

My present invention has for its object to remedy the difficulty abovementioned; and to this end, it consists in the improved form andrelative arrangement of the blades of the cutter-head and the fixedshear-blade whereby the outer or front surfaceof the cutter-head is madeapproximately conical, so

that it conforms to the curvature of the shankprevents the blades at theopposite side of the cutter from the fixed shear-blade from Serial No.543,030. on modeLl touching the work, as I will now proceed to morefully describe.

Of the accompanying drawings, forming a part of this specification,Figure 1 represents a side elevation of that portion of a.trimming--machine embodying myimprovements. Fig. 2 represetits an end view of theparts shown in Fig. 1. Fig. 3 represents a top View of the same. Fig. 4represents a view of the opposite side from that shown in Fig. 1. Fig. 5represents a section on line 5 5 of Fig. 3, showing, also, a section ofa portion of the boot or shoe. v

The same letters of reference indicate the same parts in all thefigures.

In the drawings, a representsa rotary shaft journaled in a suitablefixed bearing b, and 0 represents a cutter-head affixed to said shaftand provided With diverging blades. The outer sides 0' of said bladesare oblique to the axis of the cutter, as shown in Figs. 1, 3, 4, and 5,each being inclined backwardly from the center of the cutter-head to theouter end of the blade. The cutting edges are formed by the intersectionof the inclined face with one of the sides of each blade, so that saidcutting edges are also obliquely arranged and inclined, as abovedescribed, the result being that the outer face or front of thecutter-head has an approximately conical form, which enables it to actin the re-entrant curve or shank-portion of a boot or shoe, withoutcontact between the blades at the opposite side from the fixedshear-blade and adjacent portions of the Work.

(1 represents the fixed shear-blade, having a cutting edge (2 which islocated at one side of the axis of the cutter-head and has the sameoblique arrangement as the blades of the cutter-head, so that it is inposition to co-operate with each blade of the cutterhead in succession,at one side of the axis thereof, said blade supporting the channellip eand the edge e of the upper in position to hold the superfluous materialof the said lip and the upper in position to be trimmed by the conjointaction of the fixed and revolv in'g shear-blades.

It will be seen by reference to Fig. 3, where the shoe is shown indotted lines in the posi tion it occupies while the shank-portions arebeing trimmed, that the blades of the cutterhead can act only on theshoe at the point where it is supported by the fixed shear-blade, theblades at the opposite side of the cutterhead from said shear-bladebeing out of contact with the work, so that they cannot cut or injureit.

The fixed shear-blade d is attached to an arm 01 which is secured by aset-screw d to the supporting-frame of the machine.

I claim In a channel edge or lip trimmer, the combination of a shaft orspindle, a cutter-head affixed thereto and having diverging shearbladesthe outer faces and cut-ting edges of which are oblique to the axis ofthe, cutter In testimony whereof I have signed my name to thisspecification, in the presence of two subscribing witnesses, this 19thday of January, A. D. 1894:.

ELMER S. HARRIS.

Witnesses:

O. F. BROWN, A. D. HARRISON.

